Hertel 16EL24UNJHG225T Threading Insert 24 Tpi Solid Carbide

Product Description

The HERTEL 16EL24UNJHG225T is a laydown-style threading insert designed for cutting external UNJ threads on a lathe or threading-capable CNC turning center. Manufactured from solid carbide with a TiAlN coating applied via PVD process, this insert delivers wear resistance and thermal stability during continuous or interrupted threading passes. It is configured for left-hand thread cutting at 24 threads per inch (TPI), making it a fit for aerospace and hydraulic fitting applications where UNJ thread forms are specified. The 3/8-inch inscribed circle and 0.146-inch thickness match the 16EL insert style seating geometry.

This insert is used in external threading operations on metalworking lathes and turning centers wherever UNJ-standard thread forms are required. UNJ threads feature a controlled root radius that improves fatigue resistance, making them common in aerospace fastener and fluid-system component machining. The left-hand configuration is specified when the part design calls for a left-hand helix. Machinists and CNC operators in aerospace, defense, and precision fluid-power shops are the primary users of this insert geometry.

Key Features

• Solid carbide substrate provides rigidity and wear resistance for threading hard and abrasive materials
• TiAlN coating via PVD process improves surface hardness and oxidation resistance at elevated cutting temperatures
• 24 TPI left-hand external UNJ thread form ground into the insert profile
• 3/8-inch inscribed circle fits standard 16EL toolholder pocket geometry
• 0.146-inch insert thickness for positive seating and repeatable thread depth
• Laydown insert orientation for use in laydown-style threading toolholders

Compatibility

Designed as an OEM-style replacement threading insert for 16EL-style laydown threading toolholders accepting a 3/8-inch inscribed circle insert with 0.146-inch thickness.

Installation Notes

This insert is installed by a machinist or CNC operator into a compatible 16EL laydown threading toolholder. Power down and lock out the machine spindle before changing inserts. Use the correct torque wrench or insert key as specified by the toolholder manufacturer to seat the insert without cracking the carbide. Inspect the toolholder pocket for wear or debris before seating a new insert to ensure proper clamping and thread-form accuracy.